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重点讲解：
1. come from 来自；
Help may also come from some unexpected places.
帮助也可能来自某些意想不到的地方。
2. die out 逐渐消亡；灭绝；绝种；
How did the dinosaurs die out?
恐龙是如何灭绝的？
3. show up 出现；
They're worried about other leaks that might show up in other spots around the plant.
他们担心核电站周边还会出现其他的泄漏点。
